python-etcd
本文内容纲要:
- Client 对象- 实例化对象
-
- 全局网络锁
Client 对象
['_MDELETE', '_MGET', '_MPOST', '_MPUT', '__class__', '__contains__', '__del__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_allow_reconnect', '_allow_redirect', '_base_uri', '_check_cluster_id', '_comparison_conditions', '_del_conditions', '_discover', '_get_headers', '_handle_server_response', '_machines_cache', '_next_server', '_protocol', '_read_options', '_read_timeout', '_result_from_response', '_sanitize_key', '_stats', '_use_proxies', '_wrap_request', 'allow_redirect', 'api_execute', 'api_execute_json', 'base_uri', 'delete', 'election', 'eternal_watch', 'expected_cluster_id', 'get', 'get_lock', 'host', 'http', 'key_endpoint', 'leader', 'leader_stats', 'machines', 'members', 'password', 'pop', 'port', 'protocol', 'read', 'read_timeout', 'set', 'stats', 'store_stats', 'test_and_set', 'update', 'username', 'version_prefix', 'watch', 'write']
类属性
http
实例属性
allow_redirect
base_uri
election # Election primitives were removed from etcd 2.0
expected_cluster_id
host
key_endpoint
leader
leader_stats
machines
members
port
protocol
read
read_timeout
stats
store_stats
version_prefix
instancemethod 实例方法
api_execute
api_execute_json
delete
eternal_watch
get
get_lock
pop
set
test_and_set
update
watch
write
** 实例化对象**
** 函数原型:**
def __init__( self,
host='127.0.0.1', # mixed:类型-字符串(IP地址),元组((host,port),(host.port),...) 支持多个etcd服务端的连接。
port=4001, #
srv_domain=None,
version_prefix='/v2',
read_timeout=60,
allow_redirect=True,
protocol='http',
cert=None,
ca_cert=None,
username=None,
password=None,
allow_reconnect=False,
use_proxies=False,
expected_cluster_id=None,
per_host_pool_size=10
):
** 实例: **
import etcd#
client = etcd.Client() # this will create a client against etcd server running on localhost on port 4001
client = etcd.Client(port=4002)
client = etcd.Client(host='127.0.0.1', port=4003)
client = etcd.Client(host='127.0.0.1', port=4003, allow_redirect=False) # wont let you run sensitive commands on non-leader machines, default is true
client = etcd.Client(
host='127.0.0.1',
port=4003,
allow_reconnect=True,
protocol='https',)
全局网络锁
1 client = etcd.Client() 2 lock = client.get_lock('/customer1', ttl=60)
3
4 # Use the lock object:
5 lock.acquire()
6 lock.is_locked() # True
7 lock.renew(60)
8 lock.release()
9 lock.is_locked() # False
10
11 # The lock object may also be used as a context manager:
12 client = etcd.Client()
13 lock = client.get_lock('/customer1', ttl=60)
14 with lock as my_lock:
15 do_stuff()
16 lock.is_locked() # True
17 lock.renew(60)
18 lock.is_locked() # False
1 # 创建etcd客户端对象,
2 # allow_redirect=True 这个参数是当断链的时候,etcd会再次复用connect创建可用的连接
3 client = etcd.Client(
4 host='127.0.0.1',
5 port=4003,
6 allow_reconnect=True,
7 protocol='https',)
8
9 client.write('/nodes/n1', 1)
10
10 # with ttl 设置几秒,几秒后这数据就没了
11 client.write('/nodes/n2', 2, ttl=4) # sets the ttl to 4 seconds
12
12 # create only
13 client.write('/nodes/n3', 'test', prevExist=False) prevExist 如果数据有的话,就不再插入了。
14
15 client.write('/nodes/n3', 'test2', prevValue='test1') 保证value以前是test1
16
17 # mkdir
18 client.write('/nodes/queue', dir=True) 新版本不用这个也行,最少我不用指明dir 也是可以创建mkdir的
19
19 # Append a value to a queue dir
20 client.write('/nodes/queue', 'test', append=True) #will write i.e. /nodes/queue/11
21 client.write('/nodes/queue', 'test2', append=True) #will write i.e. /nodes/queue/12
对于数据的修改也可以用 update
1 result = client.read('/foo')2 print(result.value) # bar
3 result.value += u'bar'
4 updated = client.update(result)
5 print(updated.value)
用read()方法 从etcd获取节点数据
client.read('/nodes/n2').value#recursive递归的目录
#sorted 排序
r = client.read('/nodes', recursive=True, sorted=True)
for child in r.children:
print("%s: %s" % (child.key,child.value))
#相当于zookeeper的watch监听
client.read('/nodes/n2', wait=True) #Waits for a change in value in the key before returning.
client.read('/nodes/n2', wait=True, waitIndex=10)
本文内容总结:Client 对象, 实例化对象,,全局网络锁,
原文链接:https://www.cnblogs.com/doscho/p/6222994.html
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